/*默认样式，主要是position:fixed实现屏幕绝对定位*/
#gotoTop {
    width: 40px;
    height: 40px;
    display: none;
    position: fixed;
    top: 75%;
    right: 5%;
    cursor: pointer;
    line-height: 40px;
    text-align: center;
    border: 1px solid #9999a6;
    transition: .3s;
    border-radius: 50%;
    background: linear-gradient(145deg, #baa7a7, #ddc6c6);
    box-shadow: 20px 20px 60px #b09d9d, -20px -20px 60px #eed5d5;

}

/*鼠标进入的反馈效果*/
#gotoTop:hover {
    color: #fff;
    text-decoration: none;
    border: 1px solid #fff;
}

.iconfont {
    font-size: 40px;
}